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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b5a805e718c4f09af448b0593e15e77cab0e72bae0c63cbbea51508a713d5e' 
  AND token = 'O5La5/A4I4nKN9SPo+C0i0EPYKLAei6hbcOdmeIgi4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}